Construction of cross-linked networks in polylactic acid biocomposites by using vegetable oil-modified collagen fibers for improving anti-stress relaxation and toughness

IF 5.6 1区农林科学 Q1 AGRICULTURAL ENGINEERING

Industrial Crops and Products Pub Date : 2024-02-01 DOI:10.1016/j.indcrop.2024.118160

Chao Lei , Weixing Xu , Bi Shi , Yunhang Zeng

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Abstract

Polylactic acid (PLA) is a typical bio-based polymer derived from crops. Its widespread application has been limited due to stress relaxation and brittleness. Here, a sustainable strategy to simultaneously improve the anti-stress relaxation and toughness of PLA biocomposites was proposed by blending PLA with epoxidized soybean oil (ESO)-modified collagen fiber (CF, ESO-CF). ESO enhanced the interfacial interaction between ESO-CF and PLA by constructing cross-linked networks in ESO-CF/PLA. Comparative analyses of stress relaxation and fracture behaviors were conducted between ESO-CF/PLA and pure PLA. The stress–strain curves of ESO-CF/PLA showed lower peak stress reduction rate (1% strain; 27.1%) and irrecoverable strain (zero stress; 0.3%) after 10 cycles compared with those of pure PLA, indicating that the introduction of ESO-CF greatly improved the anti-stress relaxation of PLA. Moreover, the elongation at break and the impact strength of ESO-CF/PLA were 301.6% and 78.9% higher than those of pure PLA, respectively, indicating that ESO-CF improved the toughness of PLA. The enhancements were mainly attributed to the naturally multidirectional and hierarchical structure of ESO-CF and the effective interfacial interaction between ESO-CF and PLA. This work provides insights into the development of PLA biocomposites with enhanced mechanical properties by blending with vegetable oil-modified natural fibers.

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利用植物油改性胶原纤维在聚乳酸生物复合材料中构建交联网络，改善抗应力松弛和韧性

聚乳酸（PLA）是从农作物中提取的一种典型的生物基聚合物。由于应力松弛和脆性，它的广泛应用受到了限制。本文提出了一种可持续的策略，通过将聚乳酸与环氧化大豆油（ESO）改性胶原纤维（CF，ESO-CF）混合，同时提高聚乳酸生物复合材料的抗应力松弛性和韧性。通过在 ESO-CF/PLA 中构建交联网络，ESO 增强了 ESO-CF 和 PLA 之间的界面相互作用。对 ESO-CF/PLA 和纯聚乳酸的应力松弛和断裂行为进行了比较分析。与纯聚乳酸相比，ESO-CF/PLA 的应力-应变曲线在 10 次循环后显示出更低的峰值应力降低率（1%应变；27.1%）和不可恢复应变（零应力；0.3%），表明 ESO-CF 的引入大大改善了聚乳酸的抗应力松弛性能。此外，与纯聚乳酸相比，ESO-CF/PLA 的断裂伸长率和冲击强度分别提高了 301.6% 和 78.9%，表明 ESO-CF 提高了聚乳酸的韧性。韧性的提高主要归功于ESO-CF天然的多向分层结构以及ESO-CF与聚乳酸之间有效的界面相互作用。这项研究为通过与植物油改性天然纤维共混来开发具有更佳机械性能的聚乳酸生物复合材料提供了新的思路。

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来源期刊

Industrial Crops and Products 农林科学-农业工程

CiteScore

9.50

自引率

8.50%

发文量

1518

审稿时长

43 days

期刊介绍： Industrial Crops and Products is an International Journal publishing academic and industrial research on industrial (defined as non-food/non-feed) crops and products. Papers concern both crop-oriented and bio-based materials from crops-oriented research, and should be of interest to an international audience, hypothesis driven, and where comparisons are made statistics performed.